alan smith wrote:
> I have solid hardware working with a 16F887, least solid in the
> fact the IO works fine.  I took the same board, and replaced it
> with a 18F4420, as its the only part I could identify that its pretty
> much a drop in replacement, in as much as pin definitions, etc.
>
> So the code ports over, and with eliminating the page boundary calls
> and other minor things, its cycling and doing its thing, almost.

There are issues than pages to worry about.  Pages is the easiest since they
are essentially gone.  Banking is easier, but still there.  Then there are a
lot of subtle things, like the rotate instructions having different names,
and some instructions effecting status bits differently.  Any GOTO $-1 will
be broken as instructions now take two addresses instead of 1.  All in all
though, going from a PIC 16 to a PIC 18 is not too bad as long as the code
was written responsibly in the first place.

> The ports that are outputs work fine, the drive what they are supposed
> to drive.  But the inputs are not working, so thats what makes
> me go hmmmmm......

You forgot to turn off the A/D and/or the comparator.


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